linux-kernel - [PATCH 9/10] drivers/md: Use kstrdup

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Date:	Fri, 14 May 2010 21:31:07 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Neil Brown <neilb@...e.de>, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 9/10] drivers/md: Use kstrdup

From: Julia Lawall <julia@...u.dk>

Use kstrdup when the goal of an allocation is copy a string into the
allocated region.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to;
expression flag,E1,E2;
statement S;
@@

-  to = kmalloc(strlen(from) + 1,flag);
+  to = kstrdup(from, flag);
   ... when != \(from = E1 \| to = E1 \)
   if (to==NULL || ...) S
   ... when != \(from = E2 \| to = E2 \)
-  strcpy(to, from);
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/md/dm-crypt.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff -u -p a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1168,12 +1168,11 @@ static int crypt_ctr(struct dm_target *t
 	if (ivmode && cc->iv_gen_ops) {
 		if (ivopts)
 			*(ivopts - 1) = ':';
-		cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL);
+		cc->iv_mode = kstrdup(ivmode, GFP_KERNEL);
 		if (!cc->iv_mode) {
 			ti->error = "Error kmallocing iv_mode string";
 			goto bad_ivmode_string;
 		}
-		strcpy(cc->iv_mode, ivmode);
 	} else
 		cc->iv_mode = NULL;
 
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